Naum Gershenzon
Research Associate Professor
PhD in Physics and Mathematics
The major areas of my scientific
research experience include:
-
Nonlinear
integrable equations
- Mechano-electromagnetic phenomena in
ionic crystals
- Seismo-electromagnetic phenomena
- Magnetosphere-Ionosphere
plasma
- Software development for
scientific and educational purposes
Nuclear
magnetic resonance (NMR) spectroscopy is a phenomenon widely used in chemistry,
biochemistry, solid state and medical imaging. All applications require
radio-frequency (rf) pulses for sample excitation. The growing demand
for rf
pulses with given characteristics requires new methods/algorithms for their
design. One of the most advance methods is based on optimal control theory. I’m
developing theoretical and computational algorithms for rf pulse design utilizing optimal control
theory [Geshenzon et al, 2006] These
pulses have important applications for improved performance in NMR.
Nonlinear integrable equations
For
over a century a paramount task of traditional mathematical physics has been
the solution of three linear partial differential equations: the wave equation,
the heat conduction equation, and
Mechano-electromagnetic phenomena in ionic
crystals
There
are a few known mechano-electromagnetic phenomena in
ionic crystals including the non-classical piezoelectric effect (Stepanov effect): the movement of electrically charged dislocation
under mechanical stress. Most likely this effect is important in phenomena
observed in monocrystals such as the generation of
electromagnetic impulse during rupture [Gershenzon
et al, 1986], the influence of a static magnetic field on the mechanical
strength of samples [Gershenzon et al,
1988; Biadzhi et al, 1990] as
well as on the direction of rupture propagation [Gershenzon et al, 1986], and the influence of
ultraviolet emission on microcrack formation [Gershenzon et al, 1987]. As a
theoretician I have worked with a group of experimentalists who discovered the
aforementioned effects.
Seismo-electromagnetic phenomena
During
the past 40 years a wealth of seismo-electromagnetic
(SEM) data has accumulated which has been interpreted as having some relation
to pre-seismic and seismic processes. The search for SEM anomalies has spanned
a wide frequency range from quasi-static (periods of weeks or months) up to
radio frequencies (<50 MHz). Both
magnetic and electric fields have been measured, using detectors below ground
as well as above ground. A partial list of the types of anomaly which have been
reported includes: tectonomagnetic (local
quasi-static changes of the geomagnetic field); electrotelluric
(local quasi-static changes of the electrotelluric
field over periods of week, hours or minutes); magnetic fluctuations in the
ultra-low frequency (ULF) range (10-2 to 10Hz); electromagnetic
emission in the radio-frequency range (1 kHz to 50 MHz). For over 20 years I
have been developing the unified model(s) describing these phenomena [Gokhberg et al, 1984; Gershenzon et al, 1987a; Gershenzon et al, 1987b; Gershenzon & Gokhberg, 1989;
Gershenzon et al, 1989; Dobrovol'sky et al, 1989; Gershenzon et al, 1990; Gershenzon & Gokhberg, 1992a;
Gershenzon & Gokhberg,
1992b; Gershenzon & Gokhberg, 1993; Gershenzon
et al, 1993a; Gershenzon & Gokhberg, 1994; Gershenzon
& Bambakidis, 2001; Hunt et al,
2006].
Seismic
waves are commonly used for prospecting the upper earth crust. Usually seismic
waves generate an electromagnetic field due to variety of mechano-electromagnetic effects, which can be used as
complimentary information to the seismic data. I had been modeling the
parameters of electromagnetic response due to seismic wave [Gershenzon, 1992a; Gershenzon,
1992b; Wolfe et al, 1996] and seismic impulse [Gershenzon et al, 1993b].
Magnetosphere-Ionosphere
plasma
Various
types of geomagnetic variations monitored on the Earth’s surface are manifestations
of complicated processes due to the interaction of the solar wind with the
magnetosphere and ionosphere. Some of these variations can be explained by
hydrodynamic instabilities in the E-layer of the ionosphere [Al'perovich & Gershenzon,
1981] or the appearance of various types of inhomogeneities
[Al'perovich et al, 1986a; Al'perovich et al, 1986b; Al'perovich et al, 1986c]. The Van Allen
belt generates specific low-frequency geomagnetic variations usually appearing
during geomagnetic storms. I developed a model allowing reconstruction of Van
Allen belt parameters by measurement of geomagnetic variations [Gershenzon, 1981; Gershenzon
& Krylov, 1982; Gershenzon, 1983a; Gershenzon,
1983b; Gershenzon, 1983c; Afonina et al, 1982a; Afonina et al, 1982b].
Gene
expression is a fundamental process involving participation of many regulatory
proteins. We are now at the preliminary stage of understanding of this multi-step multi-level process. Less than one fourth of
known human promoters can be described on the level of basal transcription
machinery by known transcription scenarios. My colleague and I developed a
computational approach, allowing classification of eukaryotic promoters based
on known transcription mechanisms as well as prediction of new mechanisms [Gershenzon
& Ioshikhes, 2005]. So far we utilized this method for analysis of
core promoter elements in human and Drosophila
promoter databases (Gershenzon & Ioshikhes, 2005;
Lee et al, 2005; Gershenzon
et al, 2006).
The
identification of thousands of transcription factor binding
sites (TFBS) (so-called cis-regulatory elements) for each of thousands of
transcription factors is a necessary part of the elucidation of the gene
expression puzzle. Many experimental and computational approaches have been
developed during the last three decades to solve this problem. One of the most
widely applied methods for searching TFBS is Position-Weight Matrices
(PWM), yet the majority of existing PWMs provide a
low level of both sensitivity and specificity. Recently, we developed and applied
a computational algorithm allowing improvement of PWM quality based on the
putative sites revealed from the promoter database [Gershenzon et al, 2005].
On origin of the atmosphere light
during earthquakes [Grigoryev et al,
1988; Grigoryev et al, 1989]
Generation of longitudinal waves in stochastic plasma [Gershenzon et al, 1986]
Electromagnetic
prediction of tsunami [Gershenzon
& Gokhberg, 1992]
Protection
of nuclear stations from earthquake [Gershenzon,
1990]
Mechanisms
of influence of electric field on processes of oil segregation [Gershenzon, 1993]
Ionosphere
anomalies generated by seismic events [Larkina
et al, 1983; Gokhberg et al, 1984;
Belen'kaya et al, 1986]
Software development for scientific and educational
purposes
Modern
science as well as education utilizes a variety of software. There are a
countless number of publicly available software packages which could be
utilized. Yet every new task seems to require more suitable and flexible
software. As a fluent C++ programmer, I usually prefer to develop the necessary
software myself [Wagner & Gershenzon, 2002, http://www.wright.edu/~naum.gershenzon/VLE.html;
Gershenzon &
Ioshikhes, 2005 (http://bmi.osu.edu/~ilya/promoter_classifier/)].
Gershenzon N.I., Skinner T.E., and Glaser S.J.
Optimal Control Design of Excitation Pulses for NMR to Accommodate Relaxation, Journal of Magnetic Resonance, (in
preparation).
Hunt A., Gershenzon N., and Bambakidis G.
(2006) Pre-seismic electromagnetic phenomena in the framework of percolation
and fractal theories, Tectonophysics
(in press).
Gershenzon N.I., Trifonov E.N., and Ioshikhes I.P. (2006) The features of Drosophila
core promoters revealed by statistical analysis. BMC
Genomics, 21;7(1):161.
Gershenzon N.I, Stormo
G.D., and Ioshikhes
I.P. (2005) Computational technique for improvement of the
Position-Weight Matrices for the DNA/protein binding sites. Nucleic Acids Res., 33(7) 2290-2301.
Gershenzon N.I., Ioshikhes I.P. (2005) Synergy of human Pol
II core promoter elements revealed by statistical sequence analysis. Bioinformatics, 21, 1295-1300.
Gershenzon N.I. and Ioshikhes
I.P. (2005) Promoter Classifier: software package for promoter database analysis. Appl. Bioinformatics, 4(3), 205-209. (http://bmi.osu.edu/~ilya/promoter_classifier/).
Lee D.H., Gershenzon N.I., Gupta
M., Ioshikhes I.P., Reinberg
D, and Lewis B.A. (2005) Functional Characterization of Core Promoter Elements:
The DCE Is Recognized by TAF1. Molecular
& Cellular Biology, 25(21),
9674-86.
Wagner W. and Gershenzon
N.I. (2002) Physics 202: General Physics Laboratories - Electricity and
Magnetism; User’s guide, Wright State
University. 173 pages.
Gershenzon N. and Bambakidis G, (2001)
Modeling of seismo-electromagnetic phenomena. Russian
Journal of Earth Sciences, 3(4),
247-275.
Wolfe P.J., Yu J., and Gershenzon
N.I. (1996) Seismoelectric studies in an outwash
plain, Proc.Symp. on the Appl. of Geophys. to
Gershenzon N.I. (1994) Interaction
of a Group of Dislocations within the Framework of the Continuum Frenkel-Kontorova Model. Physical
Review B, 50, 13308-13314.
Gershenzon N.I. and Gokhberg
M.B. (1994) On the Origin of ULF Magnetic
Disturbances Prior to the Loma Prieta Earthquake. Izvestiya
Gershenzon N.I., Gokhberg
M.B., and Gugl'elmy A.V. (1993)
Electromagnetic Field of Seismic Impulse. Izvestiya
Gershenzon N.I., Gokhberg
M.B., and Yunga S.L. (1993) On the Electromagnetic Field of an Earthquake Focus. Physics
of the Earth and Planetary Interiors,
77, 13-19.
Gershenzon N.I. and Gokhberg
M.B. (1993) On Origin of the Electrotelluric
Field Disturbances Prior to an Earthquake in
Gershenzon N.I (1993) Mechanisms
of influence of electric field on processes of oil segregation. Book “Influence of seismic vibration on oil
deposits”, edited by V.N.Nikolaevsky,
Gershenzon N.I. (1992) Seismoelectromagnetic Field of Electrokinetic Nature. Izvestiya
Gershenzon, N.I. (1992) About
E.M. Strelkov's article "Estimation of Magnetic
Field of Seismoelectric Currents". Izvestiya
Gershenzon N.I and Gokhberg
M.B. (1992) On the Origin of Electrotelluric
Disturbances Prior to Earthquake. Proceeding
on the International School of Solid Earth Geophysics5th course: Earthquake
Prediction, Erice, Italy July 16-23, 1989,
515-525.
Gershenzon N.I. and Gokhberg
M.B. (1992) Electromagnetic Prediction of
Tsunami. Izvestiya
Gershenzon N.I. and
Gokhberg M.B. (1992) On Earthquake Precursors in
Geomagnetic Field Variations of Electrokinetic
Nature. Izvestiya
Biadzhi P.F., Gershenzon N.I., Zilpimiani D.O., Mandzhgaladze P.V., Pokhotelov O.A., Sgrin'ya V., and
Chelidze Z.T. (1990)
Influence of a Magnetic Field on Mechanical Properties of Ionic Crystals
During their Deformation. Soviet Physics,
Gershenzon N.I., Gokhberg M.B., Kurchashov Yu.P., Chirkov E.B., Chernyi V.I., Drumya A.V., and Bogorodsky M. M., (1990) On the Generation of Electrotelluric Fields by Crustal
Geodynamic Processes. Proceeding of International
Dobrovol'sky I.P., Gershenzon N.I., and Gokhberg M.B. (1989) Theory of Electrokinetic
Effects Occurring at the Final Stage in the Preparation of a Tectonic
Earthquake. Physics of the Earth and
Planetary Interiors, 57,
144-156.
Gershenzon N.I., Gokhberg M.B., Karakin A.V., Petviashvili
N.V., and Rykunov A.L. (1989) Modeling the Connection
Between Earthquake Preparation Processes and Crustal Electromagnetic Emission. Physics of the Earth and Planetary Interiors, 57, 129-138.
Grigoryev A.I., Gershenzon N.I., and Gokhberg M.B. (1989) Parametric Instability of Water Drops
in an Electric Field as a Possible Mechanism for Luminous Phenomena Accompanying
Earthquakes. Physics of the Earth and Planetary Interiors, 57, 139-143.
Gershenzon N.I., Gokhberg
M.B., and Dobrovol'sky I.P.
(1989) Computation of Short-Range Earthquake Precursors in Electrotelluric
Field. Izvestiya Akademii Nauk SSSR, Physics of the Solid Earth, 25(11), 901-912.
Gershenzon N.I and Gokhberg
M.B. (1989) On the Origin of Electrotelluric
Disturbances Prior to Earthquake. Proceeding of Symposium on Electromagnetic Compatibility,
Gurevich A.V., Gershenzon N.I., Krylov A.L., and Mazur N.G. (1989) Solutions of
the sine-Gordon Equation by the Modulated-Wave Method and Application to a
Two-State Medium. Soviet
Physics, Doklady. 34(3),
246-248.
Gershenzon N.I., Zilpimiani
D.O., Mandzhgaladze
P.V., and Pokhotelov O.A. (1988) Enhancement of the
Mechanical Strength of LiF Single
Grigoryev A.I., Gershenzon N.I., and Gokhberg M.B. (1988) On Origin of the Atmosphere Light
During Earthquakes. Doklady Akademii Nauk
SSSR. 300(5), 1087-1090.
Gershenzon N.I., Zilpimiani
D.O., Mandzhgaladze P.V.,
and Pokhotelov O.A. (1987) Influence of Ultraviolet Radiation
on Formation of Cracks in Ionic
Gershenzon N.I., Gokhberg M.B., Morgunov V.A., and Nikolaevskiy
V.N. (1987) Sources of Electromagnetic Emissions Preceding
Seismic Events. Izvestiya Akademii Nauk SSSR, Physics of the Solid Earth, 23(2), 96-101.
Gershenzon N.I., Gokhberg M.B., and Morgunov V.A. (1987) Sources of Electromagnetic Emissions
prior Seismic Events. Earthquake
prediction. Donish.
Gershenzon N.I., Krylov
A.L., and Masur N.G. (1986)
Amplification of Longitudinal Waves during Interaction of Bunch with
Chaotic-Inhomogeneous Plasma. Fizika Plazmy. 12(5), 1069-1073.
Al'perovich L.S., Gershenzon N.I., and Krylov A.L. (1986) Fluctuations of Quasi-stationary Electric
and Magnetic Fields Caused by Random Inhomogeneities
of Wind Motions in the Ionosphere. Geomagnetism
and Aeronomy, 26(3), 335-339.
Al'perovich L.S., Gershenzon N.I., and Krylov A.L. (1986)
Fluctuations of Quasistationary Electric and
Magnetic Fields Caused by Random Inhomogeneities of Ionosheric Conductivity, Geomagnetism and Aeronomy, 26(6), 787-789.
Al'perovich L.S., Gershenzon N.I., and Krylov A.L. (1986) The Relation
Between the Spatial and Temporal Spectra of Ionosphere Wave Disturbances. Geomagnetism and Aeronomy,
26(6), 863-865.
Belen'kaya B.N., Gershenzon
N.I., Gokhberg M.B., and Dremukhina
L.A. (1986) Inhomogeneity in the Field of Geomagnetic
Variations of the Magnetosphere-Ionosphere Current Systems in Middle latitudes. Izvestiya Akademii Nauk SSSR, Physics of the Solid Earth, 22(8), 665-669.
Gershenzon
N.I., Zilpimiani D.O., Mandzhgaladze
P.V., Pokhotelov O.A., and Chelidze
Z.T. (1986). Electromagnetic
Emission of the Crack Top during Rupture of Ionic
Gershenzon
N.I., Zilpimiani D.O., Mandzhgaladze P.V., and Pokhotelov
O.A. (1986) Effect of a Magnetic Field on the Fracture of LiF
Single
Gokhberg M.B., Gufel'd
I.L., Gershenzon N.I., and Pilipenko
V.A. (1985) Electromagnetic Effects During Rupture of
the Earth's Crust. Izvestiya Akademii Nauk SSSR, Physics
of the Solid Earth, 21(1),
52-63.
Gokhberg M.B., Gershenzon
N.I., Gufel'd I.L., Kustov A.V., Liperovskiy
V.A, and Khusameddinov S.S. (1984) Possible Effects of the Action of Electric
Fields of Seismic Origin on the Ionosphere. Geomagnetism
and Aeronomy, 24(2), 183-186.
Gershenzon N.I. and Gokhberg M.B. (1984) A Technique for
Isolating the Effects of Variations of the Geomagnetic Field Associated with Seismicity. Geomagnetism
and Aeronomy, 24(1), 79-82.
Gershenzon N.I. (1983)
Analysis of relationship between magnetosphere-ionosphere current systems and
geomagnetic variations. PhD
Thesis.
Gershenzon N.I. (1983) Reconstruction of
the Ring-Current Characteristics from the Ground-Level Variations in the
Geomagnetic Field. Geomagnetism and Aeronomy, 23(1),
67-70.
Gershenzon N.I. (1983) Electric Currents and Magnetic Fields of the
Plasma Inhomogeneity Located in the Inner
Magnetosphere. Geomagnetism and Aeronomy, 23(2),
206-210.
Larkina V.I., Nalivayko A.V., Gershenzon N.I., Gokhberg M.B., Liperovskiy V.A., and Shalimov
S.L. (1983) Observations of VLF Emission, Related with Seismic Activity, on the
Interkosmos-19 Satellite. Geomagnetism
and Aeronomy, 23(5), 684-687.
Gershenzon N.I. and Krylov A.l. (1982) Reconstruction of the Three-Dimensional
Current System from Variation in the Ground-Level Magnetic Field for Sloping
Lines of Force. Geomagnetism and Aeronomy, 22(3), 384-387.
Afonina R.G., Belov B.A., Gaydukov V.YU., Gershenzon N.I., Levitin A.E., Faermark D.S., and Fel'dstein Ya.I. (1982) Space-Time
Distribution of the Longitudinal Currents in the High-Altitude Daytime Sector
for Various Conditions in the Interplanetary Magnetic Field. Geomagnetism and Aeronomy, 22(3), 433- 435.
Afonina R.G., Belov B.A., Gaydukov V.YU., Gershenzon N.I., Levitin A.E., Faermark D.S., and Fel'dstein Ya.I. (1982) Model for the
Electric Field at the Morning-Evening
Al'perovich L.S. and Gershenzon
N.I. (1981) Periodic Structures in the Polar
Ionosphere and Geomagnetic Pulsations.
Geomagnetism and Aeronomy, 21(2), 192-195.
Gershenzon N.I. (1981)
Effect of Altitude-Dependent Inhomogeneity of the Ionospheric Conductivity Tensor on Longitudinal Currents. Geomagnetism and Aeronomy,
21(5), 626-628.
Patents
_________________________________________________________________________________________________________
Certificate
#1603328 (1990) N.I. Gershenzon, M.B. Gokhberg, and I.P. Dobrovol'sky. Method
of the Geodynamic Processes Investigation.
Certificate
#1599822 (1990) N.I. Gershenzon, M.B. Gokhberg, and I.P. Dobrovol'sky. Method of
the Electrotelluric Field Measurement during
Investigation of the geodynamic processes.
Scientific
reports and unpublished papers
_________________________________________________________________________________________________________
Gershenzon
N.I. (1996) Friction in the framework of the Frenkel-Kontorova
model. 10 pages (article).
Gershenzon
N.I. (1994) A model of crust movement along transform faults.18
pages (article).
Gershenzon,
N.I. (1991) Electromagnetic methods of earthquake prediction.
Gershenzon
N.I. (1990) Investigation of the possibility of protection of
nuclear stations from earthquake by monitoring of electromagnetic field of
earthquake focus.
Software packages
_________________________________________________________________________________________________________
Promoter
Classifier: software package for promoter database analysis. (http://bmi.osu.edu/~ilya/promoter_classifier/).
Physics 202: General Physics Laboratories: Electricity and Magnetism (http://www.wright.edu/~naum.gershenzon/VLE.html)
Last update: 11.2006